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【Objective】In order to prevent the loss of nutrients and prolong the shelf life of fresh walnut during storage, the best preservation conditions of low temperature storage for fresh walnut were optimized. 【Methods】In this experiment, the fresh fruits of Qingxiang were selected as the test materias. Under the conditions of cold storage [temperature: (-1±0.5)℃, relative humidity: 70%-80%], the walnut kernel moisture content, seed coat color difference, peel color conversion index, peel browning index, fruit cracking rate and decay rate were evaluated, and the comprehensive indexes were calculated according to Hassan method. Then, single factor experiments were conducted on the number of 1-methylcyclopropene (1-MCP) preservative bags, the thickness of polyethylene (PE) bags, and the number of holes on the bags. 1-MCP was directly put into the PE bag. The response surface design was used to optimize the best preservation process parameters with the comprehensive scores as the response value. Finally, according to the best preservation process parameters, the fresh walnut fruits of Qingxiang were kept fresh for 90 days, and the comprehensive quality evaluation and sensory quality level were determined according to the consulting survey results of consumers (18-45 years old). The changes of fresh walnut flavor during the preservation period were analyzed by principal component analysis.【Results】 The best technology of low-temperature storage for 5 kg fresh walnut fruits was 1 bag (0.625 g) of 1-MCP, 40 μm PE and 1 holes on the bag (hole diameter 5 mm;fresh keeping bag 400 mm × 600 mm. The theoretical comprehensive score was 94.48. From the perspectives of sensory and flavor evaluation, the sensory quality level and comprehensive quality evaluation of fresh walnut stored at low temperature for 90 days under the best technology were less than grade 2, the color difference of seed coat could not be distinguished by naked eyes, and the flavor basically did not change, which indicated that the best technology of this experiment had a good preservation effect on fresh walnut.【Conclusion】 The results showed that the best low-temperature storage technology for 5 kg the Qingxiang fresh walnut is 1 bag of 1-MCP, 40 μm PE and 1 hole on the bag. The results of this study would provide a basis for low temperature storage of fresh walnut. © 2021, Office of Journal of the Fruit Science. All right reserved. 相似文献
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水土保持生态环境监测有关问题探讨 总被引:1,自引:0,他引:1
任志勇 《山西水土保持科技》2005,(4):43-44
水土保持监测机构依法对水土保持生态环境进行监测预报,是水土保持生态环境建设的发展需要,是贯彻执行《水土保持法》的具体表现.针对水土保持监测工作中发现的一些问题,提出了水土保持监测工作的开展需要在机构、人员、设备、设施、经费、标准、规范、制度、技术等方面创造一个良好的软、硬件环境. 相似文献
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通过人工饲养和野外调查总结出花椒黄凤蝶在甘肃陇南花椒主产区的生物学特性:1年2代,以蛹越冬,翌年春季4~5月间羽化,第一代5~6月发生,第二代8~9月发生,9~10月幼虫老熟后在枝干上化蛹越冬;寄主为芸香科和伞形花科植物。 相似文献
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[目的]本着综合监管要完善机制、强化手段、严格追责的基本目标,提出一套基于侵蚀因子显性变化的区域水蚀动态监管方法,为制定精准的监督执法、检查、督导和违法违规查处的政策提供有效的方法支撑和精细的数据支持。[方法]在全面分析当前水土流失监管主要工作进展与存在问题的基础上,基于高分遥感影像、水土保持治理工程和生产建设项目前期设计资料等高空间精度、高现势性的数据,以土壤侵蚀地块为单元,精细识别侵蚀因子发生显性变化的对象,科学计算水土流失强度和面积的变化,查清引起变化的原因。[结果]侵蚀因子显性变化是指区域内某种或几种土壤侵蚀因子在局部发生变化,并呈现出显著的可被识别、可被监视的明确特征;显性变化集中体现在地块的地表坡度、土地利用类型、水土保持措施、植被覆盖度等变化。[结论]基于侵蚀因子显性变化的水土流失动态监管的技术和方法,尤其适用于年际间水土流失动态监测及其后续的监督管理。 相似文献
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为了解低磷胁迫下玉米产量性状的影响及其遗传基础,以玉米重组自交系为研究材料,分别在低磷处理和正常条件下,比较供试群体的产量及构成性状的变化,并运用复合区间作图法对其进行QTL定位。结果表明,单株产量、穗重和轴重等性状受低磷胁迫影响较大,出籽率、穗行数和粒深等性状受低磷胁迫影响较小;通径分析表明,低磷胁迫主要通过影响行粒数、百粒质量和粒深构成性状导致了单株产量的损失。在2种磷水平下共检测到23个产量及其构成性状QTL;单个QTL可解释的表型变异为4.32%~14.77%;其中,标记区间bnlg666~umc1141和umc1108~bnlg1258分布了不同性状的多个QTL。这些成簇分布QTL的染色体区域和低磷胁迫条件QTL,可为开展玉米耐低磷分子育种提供参考。 相似文献
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孝义铝矿属大型露天开采矿,年采矿量180万t,到1997年底采矿占地达222.4hm^2,占地十分严重。1993年该矿进行了土地复垦规划,计划到2000年复垦土地131.7hm^2。1990 ̄1997年,该矿实际累计复垦土地38.07hm^2,占规划复垦面积的50.1%,且复垦土地标准低,距有效解决工农争地和控制水土流失的要求还相差甚远,须加大土地复垦工作力度,使矿山用地与土地复垦尽快走向良性循环 相似文献
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